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Code Issues Releases Activity

avfilter/edge_template: Fix small inputs with gaussian_blur()

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Fixes: out of array access
Fixes: Ticket10699
Fixes: poc5ffmpeg

Found-by: Zeng Yunxiang
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2023-12-22 11:54:24 +01:00
parent e6459abfad
commit c443658d26
1 changed files with 19 additions and 10 deletions
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29
libavfilter/edge_template.c
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@@ -74,6 +74,7 @@ void fn(gaussian_blur)(int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize, int src_stride)
{
int j;
pixel *srcp = (pixel *)src;
pixel *dstp = (pixel *)dst;
@@ -81,12 +82,17 @@ void fn(gaussian_blur)(int w, int h,
src_linesize /= sizeof(pixel);
dst_linesize /= sizeof(pixel);
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
for (int j = 2; j < h - 2; j++) {
dstp[0] = srcp[(0)*src_stride];
dstp[1] = srcp[(1)*src_stride];
for (int i = 2; i < w - 2; i++) {
for (j = 0; j < FFMIN(h, 2); j++) {
memcpy(dstp, srcp, w*sizeof(pixel));
dstp += dst_linesize;
srcp += src_linesize;
}
for (; j < h - 2; j++) {
int i;
for (i = 0; i < FFMIN(w, 2); i++)
dstp[i] = srcp[i*src_stride];
for (; i < w - 2; i++) {
/* Gaussian mask of size 5x5 with sigma = 1.4 */
dstp[i] = ((srcp[-2*src_linesize + (i-2)*src_stride] + srcp[2*src_linesize + (i-2)*src_stride]) * 2
+ (srcp[-2*src_linesize + (i-1)*src_stride] + srcp[2*src_linesize + (i-1)*src_stride]) * 4
@@ -106,12 +112,15 @@ void fn(gaussian_blur)(int w, int h,
+ srcp[(i+1)*src_stride] * 12
+ srcp[(i+2)*src_stride] * 5) / 159;
}
dstp[w - 2] = srcp[(w - 2)*src_stride];
dstp[w - 1] = srcp[(w - 1)*src_stride];
for (; i < w; i++)
dstp[i] = srcp[i*src_stride];
dstp += dst_linesize;
srcp += src_linesize;
}
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
memcpy(dstp, srcp, w*sizeof(pixel));
for (; j < h; j++) {
memcpy(dstp, srcp, w*sizeof(pixel));
dstp += dst_linesize;
srcp += src_linesize;
}
}